At this point, the performance data is not collected in the DFM Cache. My understanding is that this will be added into an upcoming release but I am not sure when. I am working on a process to create Provisioning Manager resource pools that will be broken into multiple groups based on I/O capabilities and 'level of risk'. The plan is to use Performance Advisor data and some scripting to create the resource pools based on criteria. The pools would be changed on a daily or weekly basis using overall samples.
I would definitely not want to use 'current' values as you need to be mindful of the potential to have spikes and drops that could cause incorrect selection.